Just got the latest newsletter from DINAN last night. The welds, construction, design and price are spot on! Also available in ceramic black tips. I had the DINAN exhaust on my E90M3 and was extremely happy with it. This exhaust looks promising and thought I would share.

Dinan's free flow exhaust for the 1 Series M is sporty, just as it should be. Improving exhaust flow and adding a great sporty sound that is aggressive under hard acceleration with less drone than stock. Improve performance by 6 horsepower and 5 ft-lbs of torque. 100% 20 gauge-304 stainless steel construction to resist corrosion for years to come. Built with exacting specifications to ensure that the system fits correctly using the factory hangers . Designed to provide maximum flow while keeping things civilized with the Hemholtz chamber design. The design features quad 3.25" ceramic black or polished aluminum tips for a tasteful high performance look.

Benefits of the Free Flow Exhaust:

+ Built specifically for the BMW 1 Series M

+ Less "drone" than stock

+ Enjoyably louder

+ Sportier Sound

+ 100% stainless steel construction

+ Bolt-on installation using high quality BMW OEM clamps

+ Quad 3.25" laser engraved exhaust tips

+ 6 HP @ 6600 RPM, 5 FT-LB @ 6600 RPM

+ Hemholtz chamber to remove drone

+ Tilger mount bracket to reduce vibration and improve longevity

Dinan Performance Exhaust FAQ

Does a louder exhaust make more power?
Not necessarily. A freer flowing exhaust makes more power by removing friction in the exhaust system but how loud an exhaust is has to do with its packing material and or routing. It is possible for a loud exhaust to actually make less power than a stock exhaust. The best exhaust is the one that is the freest flowing and has a noise level that you enjoy.

What makes an exhaust "hummm" under light throttle?
This sound is commonly called "drone". It is caused by resonance in the exhaust system and can quickly give you a headache. Drone is the toughest characteristic to remove from an exhaust system. The use of a "hemholtz" chamber to work as a noise canceling device is a great option along with the use of butterfly valves when needed.

How are Dinan exhausts made?
All Dinan exhausts are designed and hand built in California at the Dinan Headquarters. They are welded by hand using precise tools to ensue perfect fit. All are built from 20 gauge-304 stainless steel for strength and corrosion resistance.

Does the kind of steel used matter?
Yes. Your cars exhaust is subjected to the elements and other harsh conditions that occur under a car. The exhaust gets hit with gravel, salt, water, sand and whatever else is on the road. Using high quality stainless steel keeps corrosion at bay in this tough environment.

Whoops, sorry, I did. It was posted over the weekend and I think a lot of people might miss it as well if it's in the subforums instead of the general section. Besides I'm not selling it. Mods can delete if they don't want exhaust discussion outside the subforum section.

I received the following this morning, from Dinan:The weight is virtually identical. Dramatically “cooler” exhaust note and a bit less drone running at highway speeds. No “valves” on our system, improving flow at all throttle settings. One of the best sounding exhausts we have ever produced!

Scott

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Matt Murray

I am perfectly capable of learning from my mistakes. I will surely learn a great deal today.

I received the following this morning, from Dinan:The weight is virtually identical. Dramatically “cooler” exhaust note and a bit less drone running at highway speeds. No “valves” on our system, improving flow at all throttle settings. One of the best sounding exhausts we have ever produced!

Scott

I have no doubt it will sound great, but the fact that it is not a true bolt on system that requires cutting the OEM exhaust might be a deal breaker for many. My Eisenman sport system included a connecting pipe that would bolt right up to the stock mid pipe. When I decided to go back to the OEM exhaust, the swap was a breeze.

Is there any update on their CF CAI? Last I spoke to them they were supposed to release it 'around the same time as the exhaust'.

I forgot to ask about the CAI, but he did mention that they will be releasing the stage 3 package before the end of the month which is comprised of a tune, FMIC, and oil cooler. The only way to get the warranty is to buy the entire package.

Was at DINAN this past Monday. All 1M products (CAI, FMIC, oil cooler, exhaust, stage 2 & 3 software, etc.) are now available. They are also in development on some suspension components as well. Beautiful stuff.